When you specify a replacement window, it is made
to fit the particular opening and it is important to
correctly measure the opening. There are three 
primary critical measurements involved: Width,
Height and Square. 
Width
This is the measurement that is
given first when ordering a win-
dow. Because the inside stops
and parting stops are removed,
the width must be measured
from jamb to jamb as shown. Measure at the top,
middle, and bottom and use the smallest dimension.
Height
The height of the window is taken
from the sill (from the point against
the stool) to the header (at the point
against the inside stop) as shown.
Measure at the left, middle, and right
and use the smallest dimension.
Window Fitters Guide to Window Installation 
22                ©2022 AWDI, LLC Do not reproduce without permission
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Accurate
Measurement 
is the Key 
to Quality
Installation.
Outer Sash
Inner 
Sash
Parting Stop
Brick
Mould
Balance
Weights
Blind Stop
Balances
Balances
Parting Stop
Side Jamb
Casing
BASIC WINDOW ANATOMY
Interior Stop
Rail
Sill
Stool
Apron
Muntins
SAMPLE MANUAL

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